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Re: Process cpu testing

From: Martin Pala
Subject: Re: Process cpu testing
Date: Sun, 20 Jan 2013 22:56:24 +0100


the total cpu maximum (summary for all CPU core resources) is 100% in Monit.

Single threaded application (such as soffice) which uses 100% of single CPU 
will count for 100/number_of_cpus [%]

For example if you have 8 CPUs/cores:

- multithreaded application (e.g. MySQL) or application with multiple child 
processes (Apache) which which will hog all cpus will show up as 100% cpu usage

- if single threaded application will hog cpu, it will show as 100/8=12.5%

The way how monit counts the cpu usage is similar to how memory and disk usage 
is presented by the system: 100% memory usage = summary of all memory sticks in 
the system, 100% filesystem usage = summary of free subdisks capacity (in case 
of RAID 0/5/6). If we'll go with the model where every CPU will be 100%, then 
multi-CPU systems will report for example 800% CPU usage in above described 
multithreaded application case, which will be less natural.


On Jan 20, 2013, at 5:31 PM, Aaron <address@hidden> wrote:

> I am having trouble with config for process cpu testing. 
> I have an occasional runaway soffice process that literally consumes > 90% 
> cpu until restarted. That would mean it's using one core fully. 
> In "top" this process doesn't dip under 95%, but my test where >90% for 4 
> cycles, restart never fires. 
> Is monit looking at some other number to base its percentage calculation? 
> Thanks for any tips. 
> -AJ
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